Like the volunteer environmental monitoring movement itself, the directory has grown rapidly. The first edition, published in September 1988, listed 43 programs. Just seven months later, the second edition, containing 70 entries, was produced. The expanded, updated, and revised third edition of the directory includes 133 programs. Thirty of these are brand-new programs that started within the year. During that same year many of the older programs have expanded, increasing the number of volunteers involved and the number of sites monitored, and taking on new projects. Most of the entries in this edition contain much more detailed information than in previous editions--information about specific techniques and tests used for monitoring, about funding sources, and about ways that governmental agencies are using citizen volunteer monitoring results.

"April 1990"--Cover. "EPA 503-9-90-004 ; P-1135 ; RIU-D-90-002"--Cover. "This publication has been funded wholly or in part by the US EPA under Interagency Agreement DW13934084-0 with NOAA's Sea Grant Program and the University of Rhode Island."--Page 2 of cover.